CURRENT r293712 lock order reversal

[Vladimir Botka]

On Sun, 31 Jan 2016 20:25:59 -0500
Hi,

you might want to post it to freebsd-current at freebsd.org.
More details are available here
https://www.freebsd.org/doc/faq/troubleshoot.html#idp63309008

Cheers,

	-vlado

Baho Utot <baho-utot at columbus.rr.com> wrote:

> I get the following when I unmount a thumb drive
> 
> Here is how I created the system......
> 
> I installed FreeBSD-10.2 and then updated it to CURRENT by the handbook.
> 
> I then rebuilt the whole system by using release.sh so I would have a 
> clean "install" media.
> 
> I then copied (dd) the memstick image to a thumb drive and booted to it.
> I then installed "CURRENT" from the memstick overwriting the system ie 
> "clean install"
> 
> This is from dmesg:
> 
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 11.0-CURRENT #0 r293712: Wed Jan 13 01:02:51 UTC 2016
>      root at dell.bildanet.com:/usr/obj/usr/src/sys/GENERIC amd64
> FreeBSD clang version 3.7.1 (tags/RELEASE_371/final 255217) 20151225
> WARNING: WITNESS option enabled, expect reduced performance.
> 
> lock order reversal:
>   1st 0xfffff800430c0d50 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:1224
>   2nd 0xfffff800431cc418 devfs (devfs) @ 
> /usr/src/sys/ufs/ffs/ffs_vfsops.c:1375
> stack backtrace:
> #0 0xffffffff80a7a2a0 at witness_debugger+0x70
> #1 0xffffffff80a7a1a1 at witness_checkorder+0xe71
> #2 0xffffffff809fb9bb at __lockmgr_args+0xd3b
> #3 0xffffffff80ac276c at vop_stdlock+0x3c
> #4 0xffffffff80fb81d0 at VOP_LOCK1_APV+0x100
> #5 0xffffffff80ae366a at _vn_lock+0x9a
> #6 0xffffffff80cb812a at ffs_flushfiles+0x11a
> #7 0xffffffff80c9caef at softdep_flushfiles+0x3cf
> #8 0xffffffff80cbab84 at ffs_unmount+0x84
> #9 0xffffffff80acc200 at dounmount+0x530
> #10 0xffffffff80acbc3d at sys_unmount+0x35d
> #11 0xffffffff80e6b15b at amd64_syscall+0x2db
> #12 0xffffffff80e4afdb at Xfast_syscall+0xfb
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